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Eighth Grade (Grade 8) Reactions Questions

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Grade 8 Reactions
When oxygen in the air reacts with iron, iron oxide forms. Which of the following statements is correct?
  1. This is a physical change.
  2. This is a chemical change.
  3. Iron and iron oxide have the same properties.
  4. Oxygen and iron have similar properties.
Grade 8 Reactions
A chemical equation that shows the same number of each kind of atom is considered to be
  1. balanced.
  2. unbalanced.
  3. an incomplete reaction.
  4. a replacement reaction.
Grade 8 Reactions
A substance that undergoes a change in a chemical reaction is
  1. a substance.
  2. a reactant.
  3. an enzyme.
  4. a chemical.
Grade 8 Reactions
Which of the following statements about chemical properties is true?
  1. They can be observed when the identity of a substance changes.
  2. They can always be observed without changing the identity of a substance.
  3. They are easier to observe than physical properties.
  4. They are the properties that are most useful in identifying a substance.
Grade 8 Reactions
What law says that nothing can be created or destroyed in a reaction?
  1. The Law of Physics
  2. The Law of Conservation and Mass
  3. The Law of Chemistry
  4. The Law of Conserving Chemical Reactions
Grade 8 Reactions
Which of the following is the product in the chemical formula [math]N+O_2=NO_2[/math]?
  1. [math]NO_2[/math]
  2. [math]O[/math]
  3. [math]O_2[/math]
  4. [math]N[/math]
Grade 8 Reactions
Energy is taken in
  1. exothermic
  2. electromagnetic
  3. endothermic
  4. weight
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